A pair of bank robberies Friday in Greenbrae and Mill Valley appear to be the latest work of a robber who struck in Novato this week, investigators said.

The first robbery occurred at about 2:30 p.m. Friday at the Citibank at 230 Bon Air Center Road, Twin Cities police said. The suspected robber was described as a white male in his early 20s, about 5-foot-9 with bleached blond hair and a baggy yellow plaid flannel shirt.

Prior to the robbery, the man was seen getting out of an older two-door Toyota or similar vehicle with faded green paint, said Twin Cities police Det. David Woo. The driver was described as a white male adult with a "darker complexion" and dark hair, Woo said.

An hour after that robbery, the Wells Fargo branch was robbed in Strawberry, said sheriff's Lt. Gerald Jones. The robber, also wearing a plaid shirt, handed the teller a demand note, displayed a gun in his waistband and made off with an undisclosed amount of money.

The robberies set off an intense search for the green Toyota, and police stopped two possible matches that turned out to be unrelated, Jones said. In addition, a possible suspect sighting at a Novato hotel was unfounded.

The description of the suspect is similar to that of a man suspected of robbing a Bank of Marin branch at 368 Ignacio Blvd. in Novato on Wednesday. The suspect was described as white, thin, clean shaven, 5-foot-6 to 5-foot-9 and in his early 20s, with freckles and short light hair. He was wearing a plaid flannel jacket and a black San Francisco Giants cap, and was photographed by a security camera.

"They're definitely all related," Jones said.

Anyone with information about the robber can call Bay Area Crime Stoppers at 800-222-8477. Crime Stoppers is a multilingual line, and tipsters can be eligible for a cash reward.